Civil Engineering and Architecture Vol. 10(5), pp. 1916 - 1930
DOI: 10.13189/cea.2022.100516
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Aspect Ratio and Relative Beam-Slab Stiffness Effects on the Long-term Deflection of Flat Plates and Beam Supported One-Way Slabs

Karwan Khalid Ismael ^*, Sarkawt Asaad Hasan
Department of Civil Engineering, Erbil Engineering Technical College, Erbil Polytechnic University, Iraq

ABSTRACT

This study investigates the ACI 318-19 two-way slab provisions for the long-term deflection control in flat plate slabs with an aspect ratio ranging between 1 to 3 at different panel locations (interior, edge, and corner) with a large span of 5.0 m, 7.5 m, and 10.0 m. Further, the study examines the effects of the relative beam-slab stiffness of the beams provided at the two long sides of flat plat slabs of aspect ratio greater than two using ACI318-19 recommended one-way slab thickness. The paper uses the Finite Element SAFE software to calculate the long-term deflection (LTD) by using nonlinear analysis (long-term cracked analysis) that considers concrete creep and shrinkage of two-way slabs and one-way slabs for different beam-slab stiffnesses and aspect ratios. The aspect ratio of a flat plate slab had a considerable effect on the LTD, where for slab panels of the same long span length and variable aspect ratio, as the aspect ratio gets smaller (square slab), the LTD increases, a behavior that ACI318-19 two-way slab deflection control procedures overlook. So, the deflection under the beams is within the ACI318-19 long-term deflection limits for different panel locations (interior, interior, exterior, and exterior edge). In addition, this part has been conducted to recommend a minimum relative beam-slab stiffness for the supporting beams.

KEYWORDS
Flat Plate Slab, One-Way Slab, Aspect Ratio, Long Term Deflection, Permissible Deflection, Relative Beam-Slab Stiffness, Minimum Thickness of Slab

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Karwan Khalid Ismael , Sarkawt Asaad Hasan , "Aspect Ratio and Relative Beam-Slab Stiffness Effects on the Long-term Deflection of Flat Plates and Beam Supported One-Way Slabs," Civil Engineering and Architecture, Vol. 10, No. 5, pp. 1916 - 1930, 2022. DOI: 10.13189/cea.2022.100516.

(b). APA Format:
Karwan Khalid Ismael , Sarkawt Asaad Hasan (2022). Aspect Ratio and Relative Beam-Slab Stiffness Effects on the Long-term Deflection of Flat Plates and Beam Supported One-Way Slabs. Civil Engineering and Architecture, 10(5), 1916 - 1930. DOI: 10.13189/cea.2022.100516.